Table 1: Diagnosed types of GDDs according to the classification of DSM-IV-TR [5].

Global developmental disturbances Characteristics
Autistic Disturbances* Classic autismo
Rett Syndrome Genetic condition (mutations in MECP2 gene). It mainly affects girls and reaches post-natal brain development.
Child Disintegrative Disorder Cognitive, behavioural and speech regression of 2-10 years, preceded by fully normal development, and with posterior appearance of autistic characteristics.
Asperger Disturbance* Individuals with one autistic characteristics that develop speech in expected age, without mental retardation.
Global Disturbance of non-specified Development* Individuals with some autistic characteristics, but not as severe or extensive that do not belong to any other categories.

*Together, also called Autism Spectrum Disorders (ASDs).